Taiwan's Centers for Disease Control (CDC) issued its second-highest travel advisory in its three-tier system Friday for the Guangxi Zhuang Autonomous Region in China after the region reported a case of H5N6 avian flu.

Researchers say a severe birth defect caused by Zika infection may not be apparent at birth but develop months afterward, further confirmation that the virus can cause unseen damage to developing babies.

The World Health Organization (WHO) on Friday announced that the Zika virus outbreak, linked to deformations in babies' heads and brains, no longer poses a world public health emergency, though it warned the epidemic remains a challenge.

Taiwan has confirmed a new imported case of Zika virus infection, involving a 51-year-old Taiwanese man who developed the symptoms of fever, conjunctivitis and joint pain after returning from Vietnam in late September, the Centers for Disease Control (CDC) said Saturday.